Is it safe to use 240.0.0.0/4

Wed Jun 17 21:13:20 UTC 2015

Use 100.64.0.0/10, this is the CGNAT reserved range.I would most definitely not recommend 240.0.0.0

-----Original Message-----
From: NANOG [mailto:nanog-bounces at nanog.org] On Behalf Of Luan Nguyen
Sent: Thursday, 18 June 2015 9:07 a.m.
To: nanog at nanog.org
Subject: Is it safe to use 240.0.0.0/4

Is that safe to use internally? Anyone using it?
Just for NATTING on Cisco gears...